Pembahasan Soal 1

Jawab: C

\begin{equation*}
\begin{split}
a \sqrt{3} + r & = 6 \sqrt{3} \:.\: \sqrt{3} + 12  \\\\
a \sqrt{3} + r & =6 \:.\: 3 + 12 \\\\
a \sqrt{3} + r & = 18 + 12 \\\\
a \sqrt{3} + r & = 30
\end{split}
\end{equation*}